/**
* Check if we already have a user attached to $identifer on $provider_name
* returns true if there is a user attached, false otherwise
*
* @param $provider_name
* @param $identifier
* @return bool
*/
public function checkRegistered($provider_name, $identifier)
{
$user = $this->user_repository->findbyAuth($provider_name, $identifier);
return $user !== null;
}
